<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script >
        var a=Math.random()
        var b=Math.round(4536.7)
        var c=Math.floor(45463.4564)
        var d=Math.ceil(45463.4564)
        console.log(a,b,c,d);
    </script>
</body>
</html>